@Override
 public ServiceInstance<DrillbitEndpoint> deserialize(byte[] bytes) throws Exception {
   DrillServiceInstance i = DrillServiceInstance.parseFrom(bytes);
   ServiceInstanceBuilder<DrillbitEndpoint> b = ServiceInstance.<DrillbitEndpoint>builder();
   b.id(i.getId());
   b.name(ExecConstants.SERVICE_NAME);
   b.registrationTimeUTC(i.getRegistrationTimeUTC());
   b.payload(i.getEndpoint());
   return b.build();
 }